summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/mbcache.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/include/linux/mbcache.h')
-rw-r--r--kernel/include/linux/mbcache.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/include/linux/mbcache.h b/kernel/include/linux/mbcache.h
new file mode 100644
index 000000000..6a392e7a7
--- /dev/null
+++ b/kernel/include/linux/mbcache.h
@@ -0,0 +1,55 @@
+/*
+ File: linux/mbcache.h
+
+ (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+struct mb_cache_entry {
+ struct list_head e_lru_list;
+ struct mb_cache *e_cache;
+ unsigned short e_used;
+ unsigned short e_queued;
+ atomic_t e_refcnt;
+ struct block_device *e_bdev;
+ sector_t e_block;
+ struct hlist_bl_node e_block_list;
+ struct {
+ struct hlist_bl_node o_list;
+ unsigned int o_key;
+ } e_index;
+ struct hlist_bl_head *e_block_hash_p;
+ struct hlist_bl_head *e_index_hash_p;
+};
+
+struct mb_cache {
+ struct list_head c_cache_list;
+ const char *c_name;
+ atomic_t c_entry_count;
+ int c_max_entries;
+ int c_bucket_bits;
+ struct kmem_cache *c_entry_cache;
+ struct hlist_bl_head *c_block_hash;
+ struct hlist_bl_head *c_index_hash;
+};
+
+/* Functions on caches */
+
+struct mb_cache *mb_cache_create(const char *, int);
+void mb_cache_shrink(struct block_device *);
+void mb_cache_destroy(struct mb_cache *);
+
+/* Functions on cache entries */
+
+struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
+int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
+ sector_t, unsigned int);
+void mb_cache_entry_release(struct mb_cache_entry *);
+void mb_cache_entry_free(struct mb_cache_entry *);
+struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
+ struct block_device *,
+ sector_t);
+struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
+ struct block_device *,
+ unsigned int);
+struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
+ struct block_device *,
+ unsigned int);